考虑指数流的真空预压竖井地基固结解析解

发布时间：2018-12-15 19:37

【摘要】：传统固结理论认为渗流速度和水力梯度呈线性关系,但在软塑性土地基中常出现背离线性关系的情况,即为非达西渗流模式。在经典竖井地基固结理论的基础上,假设孔隙水渗透服从指数渗流模式,并结合真空预压的边界条件,建立新的竖井地基固结计算模型,获得超静孔压和径向固结度的严格解答,并通过开展多工况算例对比,分析指数渗流模型参数和真空压力沿竖井衰减系数等对竖井地基固结计算结果的影响效应。研究结果表明:非达西渗流指数m对固结速率影响最为显著,在固结初期,m越大,固结速率越快;在固结后期,m越小,固结速率越快;涂抹区参数s及κh/κs越大,竖井地基固结速率越慢;负压衰减系数k1和k2、真空荷载p0越大,固结速率越快。
[Abstract]:The traditional consolidation theory holds that the seepage velocity is linearly related to the hydraulic gradient, but the deviation from the linear relationship often occurs in the soft and plastic soil foundation, that is, the non-Darcy seepage model. On the basis of classical vertical foundation consolidation theory, a new calculation model of vertical foundation consolidation is established on the assumption that pore water permeation mode follows exponential seepage model, and combined with the boundary condition of vacuum preloading. The strict solutions of overstatic pore pressure and radial consolidation are obtained, and the effects of the parameters of exponential seepage model and the attenuation coefficient of vacuum pressure along the shaft on the consolidation results of the vertical foundation are analyzed through the comparison of multiple working cases. The results show that the non-Darcy percolation exponent m has the most significant effect on the consolidation rate. The larger m is, the faster the consolidation rate is in the early stage of consolidation, the smaller m is in the later stage of consolidation, the faster the consolidation rate is. The larger the smear parameters s and 魏 h / 魏 s are, the slower the consolidation rate of the shaft foundation is, and the faster the consolidation rate is with the negative pressure attenuation coefficients k 1 and k 2, and the vacuum load p 0.
【作者单位】：浙江大学滨海和城市岩土工程研究中心;浙江大学软弱土与环境土工教育部重点实验室;
【基金】：国家自然科学基金资助项目(51179170)~~
【分类号】：TU472.33

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